JavaFX最小化未修饰的阶段

时间:2014-11-17 12:25:15

标签: java javafx jna

我有一个未修饰的JavaFX舞台,我自己的最小化,最大化&关闭按钮。但遗憾的是,与装饰行为相比,单击Windows 7中的任务栏图标不会自动最小化阶段。

有没有办法通过单击任务栏图标来最小化纯Java代码的未修饰阶段?如果不是,我怎么能用JNA做到这一点?

修改 好吧,我一直试图用JNA来解决这个问题,但是在C / C ++ / JNA旁边做了很多,我设置它有点麻烦。如果有人帮我把各个部分放在一起,我将不胜感激。

到目前为止,这是我的代码:

public final class Utils {

   static {
    if (PlatformUtil.isWin7OrLater()) {
            Native.register("shell32");
            Native.register("user32");
        }
    }

    // Apparently, this is the event I am after
    public static final int WM_ACTIVATEAPP = 0x1C;


    public static void registerMinimizeHandler(Stage stage) {
       // Hacky way to get a pointer to JavaFX Window
       Pointer pointer = getWindowPointer(stage);

       WinDef.HWND hwnd = new WinDef.HWND(pointer);

       // Here's my minimize/activate handler
       WinUser.WindowProc windowProc = new MinimizeHandler(stage);

       Pointer magicPointer = ... set this to point to windowProc?

       // This.. apparently, re-sets the WndProc? But how do I get the "magicPointer" that is "attached" to the windowProc?
       User32.INSTANCE.SetWindowLong(hwnd, User32.GWL_WNDPROC, magicPointer);
    }
}

 private static class MinimizeHandler implements WinUser.WindowProc {

    private Stage stage;

    private MinimizeHandler(Stage stage) {
        this.stage = stage;
    }

    @Override
    public WinDef.LRESULT callback(WinDef.HWND hWnd, int uMsg, WinDef.WPARAM wParam, WinDef.LPARAM lParam) {
        if (uMsg == WM_ACTIVATEAPP) {
            System.out.println("ACTIVATE");
        }
        return User32.INSTANCE.DefWindowProc(hWnd, uMsg, wParam, lParam);
    }
}

private static Pointer getWindowPointer(Stage stage) {
    try {
        TKStage tkStage = stage.impl_getPeer();
        Method getPlatformWindow = tkStage.getClass().getDeclaredMethod("getPlatformWindow" );
        getPlatformWindow.setAccessible(true);
        Object platformWindow = getPlatformWindow.invoke(tkStage);
        Method getNativeHandle = platformWindow.getClass().getMethod( "getNativeHandle" );
        getNativeHandle.setAccessible(true);
        Object nativeHandle = getNativeHandle.invoke(platformWindow);
        return new Pointer((Long) nativeHandle);
    } catch (Throwable e) {
        System.err.println("Error getting Window Pointer");
        return null;
    }
}

编辑2:我最终还是继续这个,但是当我重新设置WNDPROC时,我的未修饰的窗口没有响应任何事件..我正在提供一个拥有工作解决方案的自包含示例的100点声望。 Windows(7+)只是可以,我甚至不知道这在其他平台上是如何表现的。

编辑3: 好吧,我有点放弃了这一个......我把所有东西都设置得正确,并收到了事件,但是在找出正确的事件时遇到了问题......

由于对这个问题有兴趣,如果有人想继续这个,这是我的最终代码(希望它应该“开箱即用”):

public final class Utils {

    static interface ExtUser32 extends StdCallLibrary, User32 {
        ExtUser32 INSTANCE = (ExtUser32) Native.loadLibrary(
                        "user32",
                        ExtUser32.class,
                        W32APIOptions.DEFAULT_OPTIONS);

        WinDef.LRESULT CallWindowProcW(
                        Pointer lpWndProc,
                        Pointer hWnd,
                        int msg,
                        WinDef.WPARAM wParam,
                        WinDef.LPARAM lParam);

        int SetWindowLong(HWND hWnd, int nIndex, com.sun.jna.Callback wndProc) throws LastErrorException;
    }

    // Some possible event types
    public static final int WM_ACTIVATE = 0x0006;
    public static final int WM_ACTIVATEAPP = 0x1C;
    public static final int WM_NCACTIVATE = 0x0086;

    public static void registerMinimizeHandler(Stage stage) {
        Pointer pointer = getWindowPointer(stage);
        WinDef.HWND hwnd = new WinDef.HWND(pointer);
        long old = ExtUser32.INSTANCE.GetWindowLong(hwnd, User32.GWL_WNDPROC);
        MinimizeHandler handler = new MinimizeHandler(stage, old);
        ExtUser32.INSTANCE.SetWindowLong(hwnd, User32.GWL_WNDPROC, handler);
    }

    private static Pointer getWindowPointer(Stage stage) {
    try {
        TKStage tkStage = stage.impl_getPeer();
        Method getPlatformWindow = tkStage.getClass().getDeclaredMethod("getPlatformWindow" );
        getPlatformWindow.setAccessible(true);
        Object platformWindow = getPlatformWindow.invoke(tkStage);
        Method getNativeHandle = platformWindow.getClass().getMethod( "getNativeHandle" );
        getNativeHandle.setAccessible(true);
        Object nativeHandle = getNativeHandle.invoke(platformWindow);
        return new Pointer((Long) nativeHandle);
    } catch (Throwable e) {
        System.err.println("Error getting Window Pointer");
        return null;
    }
}

    private static class MinimizeHandler implements WinUser.WindowProc, StdCallLibrary.StdCallCallback {

        private Pointer mPrevWndProc32;

        private Stage stage;

        private MinimizeHandler(Stage stage, long oldPtr) {
            this.stage = stage;

            mPrevWndProc32 = new Pointer(oldPtr);

            // Set up an event pump to deliver messages for JavaFX to handle
            Thread thread = new Thread() {
                @Override
                public void run() {
                    int result;
                    WinUser.MSG msg = new WinUser.MSG();
                    while ((result = User32.INSTANCE.GetMessage(msg, null, 0, 0)) != 0) {
                        if (result == -1) {
                            System.err.println("error in get message");
                            break;
                        }
                        else {
                            System.out.println("got message: " + result);
                            User32.INSTANCE.TranslateMessage(msg);
                            User32.INSTANCE.DispatchMessage(msg);
                        }
                    }
                }
            };
            thread.start();
        }

        @Override
        public WinDef.LRESULT callback(WinDef.HWND hWnd, int uMsg, WinDef.WPARAM wParam, WinDef.LPARAM lParam) {

            if (uMsg == WM_ACTIVATEAPP) {
                // Window deactivated (wParam == 0)... Here's where I got stuck and gave up,
                // this is probably not the best event to listen to.. the app
                // does indeed get iconified now by pressing the task-bar button, but it
                // instantly restores afterwards..
                if (wParam.intValue() == 0) {
                    stage.setIconified(true);
                }
                return new WinDef.LRESULT(0);
            }

            // Let JavaFX handle other events
            return ExtUser32.INSTANCE.CallWindowProcW(
                            mPrevWndProc32,
                            hWnd.getPointer(),
                            uMsg,
                            wParam,
                            lParam);
        }
    }
}

3 个答案:

答案 0 :(得分:9)

您可以设置适当的窗口样式。它适用于XP,但在Windows 7 32位应该没问题。 我认为(但不能测试)如果你使用64位然后更改为Ptr窗口函数,即。 GetWindowLongPtr。

import com.sun.jna.Native;
import com.sun.jna.Pointer;
import com.sun.jna.platform.win32.User32;
import com.sun.jna.platform.win32.WinDef.HWND;
import com.sun.jna.platform.win32.WinUser;
import static com.sun.jna.platform.win32.WinUser.GWL_STYLE;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.TextArea;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class JNATest extends Application {
    public static void main(String[] args) { launch(args); }

    @Override
    public void start(Stage stage) {
        TextArea ta = new TextArea("output\n");
        VBox root = new VBox(5,ta);
        Scene scene = new Scene(root,800,200);
        stage.setTitle("Find this window");
        stage.setScene(scene);
        stage.show();
        //gets this window (stage)
        long lhwnd = com.sun.glass.ui.Window.getWindows().get(0).getNativeWindow();
        Pointer lpVoid = new Pointer(lhwnd);
        //gets the foreground (focused) window
        final User32 user32 = User32.INSTANCE;
        char[] windowText = new char[512];
        HWND hwnd = user32.GetForegroundWindow();
        //see what the title is
        user32.GetWindowText(hwnd, windowText, 512);
        //user32.GetWindowText(new HWND(lpVoid), windowText, 512);//to use the hwnd from stage
        String text=(Native.toString(windowText));
        //see if it's the same pointer
        ta.appendText("HWND java:" + lpVoid + " HWND user32:"+hwnd+" text:"+text+"\n");
        //change the window style if it's the right title
        if (text.equals(stage.getTitle())){
            //the style to change 
            int WS_DLGFRAME = 0x00400000;//s/b long I think
            //not the same constant here??
            ta.appendText("windows api:"+WS_DLGFRAME+" JNA: "+WinUser.SM_CXDLGFRAME);
            int oldStyle = user32.GetWindowLong(hwnd, GWL_STYLE);
            int newStyle = oldStyle & ~0x00400000; //bitwise not WS_DLGFRAME means remove the style
            newStyle = newStyle & ~0x00040000;//WS_THICKFRAME   
            user32.SetWindowLong(hwnd, GWL_STYLE, newStyle);
        }
    }

}

我的猜测是你用

替换最后3行
            long oldStyleLong = user32.GetWindowLongPtr(hwnd, GWL_STYLE).longValue();
            long newStyleLong = oldStyleLong & ~ 0x00400000l;
            user32.SetWindowLongPtr(hwnd, GWL_STYLE, new BaseTSD.LONG_PTR(newStyleLong));

为64位。我想我的User32.dll中没有这些功能,所以我无法测试它。那里有很多无关的代码,主要用于测试或教学。一旦弄清楚要做什么,就要删除未使用的线。

PS。不要添加newStyle = newStyle & ~0x00020000;//WS_MINIMIZEBOX。这是JavaFX不用于未修饰的样式标志之一。这就是为什么没有最小化的原因。也许如果您尝试设置未修饰的阶段并添加(使用|,而不是&〜)最小化框标记,您将得到相同的结果。有工具可以从任何窗口查找所有样式标志。

这是使用舞台的HWND更改未修饰舞台的最简单的代码量。

    public void start(Stage stage) {
        Scene scene = new Scene(new Pane(new Label("Hello World")));
        stage.initStyle(StageStyle.UNDECORATED);
        stage.setTitle("Find this window");
        stage.setScene(scene);
        stage.show();
        long lhwnd = com.sun.glass.ui.Window.getWindows().get(0).getNativeWindow();
        Pointer lpVoid = new Pointer(lhwnd);
        HWND hwnd = new HWND(lpVoid);
        final User32 user32 = User32.INSTANCE;
        int oldStyle = user32.GetWindowLong(hwnd, GWL_STYLE);
        System.out.println(Integer.toBinaryString(oldStyle));
        int newStyle = oldStyle | 0x00020000;//WS_MINIMIZEBOX
        System.out.println(Integer.toBinaryString(newStyle));
        user32.SetWindowLong(hwnd, GWL_STYLE, newStyle);
    }

它会打印出之前和之后的样式标志,以便您可以查找设置的样式。

答案 1 :(得分:0)

这里要注意两件事。

首先,看起来这些库似乎不是从Maven存储库添加的最新版本的JNA(截至目前的5.50)。我不得不添加4.2.1库。

第二,您可能会遇到此异常,就像我在Windows 10和Java 11上所做的那样: Error with package com.sun.glass.ui while learning Java Native Access

解决方案是转到您的IDE中的VM选项(在IntelliJ中运行->编辑配置...)并添加以下内容:

--add-exports
javafx.graphics/com.sun.glass.ui=ALL-UNNAMED

在那之后应该可以工作。

我希望看到有人实现本机Windows动画以最小化和最小化未修饰的窗口,但是我还没有进行彻底的搜索以查看是否已经进行了讨论。如果遇到解决方案,我将进行更新。

编辑:

在对Windows动画进行进一步研究后,似乎可以一起破解一个解决方案,但是我放弃了尝试在下面实现此C#黑客的方法。似乎更多的是操作系统问题,而不仅仅是JavaFX。

通过在start()中进行修改,我能够使初始窗口保持未修饰的状态,同时将其最小化并使用动画:

int newStyle = oldStyle | 0x00020000 | 0x00C00000;

但是,在最小化并重新打开它之后,Windows边框似乎很奇怪。

然后,我尝试在图标化时使用ChangeListener交换Windows样式。

stage.iconifiedProperty().addListener(new ChangeListener<Boolean>() {

        @Override
        public void changed(ObservableValue<? extends Boolean> ov, Boolean t, Boolean t1) {
            if (t1.booleanValue() == true) {
                int newStyle = oldStyle | 0x00020000 | 0x00C00000;
                user32.SetWindowLong(hwnd, GWL_STYLE, newStyle);
            } else if (t1.booleanValue() == false) {
                int newStyle = oldStyle | 0x00020000;
                user32.SetWindowLong(hwnd, GWL_STYLE, newStyle);
            }
        }
    });

这成功地使窗口最小化动画以始终正常工作,同时使(可见)舞台无边界。

一旦我找到了重新申请的最佳方法,看起来我就可以使最小化动画起作用:

int newStyle = oldStyle | 0x00020000 | 0x00C00000;
user32.SetWindowLong(hwnd, GWL_STYLE, newStyle);

图标在舞台上之前,并且边框对用户不可见。一旦实现,它可能与下面第一个链接中的C#解决方案类似。基本上,以上ChangeListener的作用相反。

与解决无边界/未经修饰的动画有关的链接:

Use windows animations on borderless form

https://exceptionshub.com/borderless-window-using-areo-snap-shadow-minimize-animation-and-shake.html

http://pinvoke.net/default.aspx/Constants/Window%20styles.html

JavaFX Minimizing & Maximing undecorated stage with animations

答案 2 :(得分:-2)

没有正确地提出你的问题..但这是解决方案

@FXML private void minimize()
{
Stage stage = (Stage) minimize.getScene().getWindow();
stage.setIconified(true);
}